Newbie File Questions

[Garrett Smith]

Sorry guys, I've forgotten all my File stuff. Been years.

I'm trying to:
1) Make a backup file of "pork.css", "pork.bak.css"
2) Open "pork.css" and write to it.

here's the basic approach I started.

    @Test
    public void editPork() throws Exception
    {
        String path = "/evs/src/test/";
        File backup = new File( path + "pork.bak.css" );
        backup.createNewFile();
        
        DataOutputStream out = new DataOutputStream( new FileOutputStream( backup ) );
        DataInputStream in = new DataInputStream(
                this.getClass().getResourceAsStream( path + "pork.css" )
            );
        try {
            out.writeChar(in.readChar());
        }
        catch(EOFException eofe){
            out.flush();
        }
    }
 

Which results in:

java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Ljava.lang.String ;) Z(Native Method)
at java.io.File.createNewFile(File.java:850)
at editPork(OneTimeSignUp.java:28)

I think I'm referencing the file wrong. What's the correct way to find the file?

[ June 16, 2006: Message edited by: Garrett Smith ]
[ June 16, 2006: Message edited by: Garrett Smith ]

[Edwin Dalorzo]

Simply read the bytes from a FileInputStream and write them to an OutputStream. It is not necessary that you create the file for the OuputStream. It will be created automatically if it does not exist.

For instance, this code copies the bytes from an InputStream into a OutputSream:

private static void copy(InputStream in, OutputStream out, int buffSize) 
throws IOException {
        
   //this buffer will store bytes read
 
   byte buffer[] = new byte[buffSize];
        
   //number of bytes read
   int sizeRead = 0;
        
   while ( (sizeRead = in.read(buffer)) > 0 ){ //reads n bytes and fills buffer
           
       out.write(buffer,0,sizeRead); //copies the read bytes in the output
            
   }
   
   out.flush(); //make sure to write all bytes to the output stream
}

You could invoke this code from any other method like this:

 
InputStream input = new FileInputStream("manifest.mf");
OutputStream output = new FileOutputStream("manifest.bak");
        
copy(input,output,1024);
        
input.close();
output.close();